CONTINUOUSLY REINFORCED CONCRETE PAVEMENT

Continuously reinforced concrete pavement - CRCP - is portland cement concrete pavement with continuous longitudinal steel reinforcement and no intermediate transverse expansion or contraction joints. Instead, the pavement is allowed to crack in a random pattern and the cracks are held tightly closed by the steel reinforcement. Regardless of the total length of the CRCP, any longitudinal movement will occur within only about 500 ft (150 m) of the pavement ends. These end movements are controlled or accommodated by proper end treatment. The current design methods for CRCP have generally evolved from longterm observation of test pavements under highway traffic. Several analytical methods also are available, but they have not been generally accepted. The base used for CRCP usually has been the same as for jointed concrete pavement, but nonerodible bases (asphalt, cement, or lime-stabilized) have gained favor in recent years because of better support and reduced deflections. The reinforcing steel in continuously reinforced concrete pavements is deformed bars, bar mats, or deformed wire fabric. Steel percentages in current use range from 0.5 to 0.7 percent (0.6 percent is ost often used) and the reinforcement usually is placed at or slightly above mid-depth of the concrete slab. Terminal treatments used at the ends of the CRCP are of two types: anchors, and expansion systems. CRC appears to have much potential as an overlay, particularly over newer highways with good geometric alignment. However, there are only a few projects that are more than three years old - too young to make any real conclusions, but they appear to be working well. Continuously reinforced concrete pavement generally is constructed in the same manner as jointed concrete pavement, and with the same equipment, except for placement of reinforcement. Because CRCP seems to be less forgiving of errors, extra care during construction is important. Another area of great concern is the construction joint. Proper consolidation of the concrete at construction joints is important, and problems have occurred where proper consolidation was not obtained.

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  • Publication Date: 1973

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  • Media Type: Digital/other
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 26 p.
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  • Accession Number: 00206064
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: May 29 1976 12:00AM